JP3831368B2 - Leakage transformer - Google Patents

Description

  The present invention relates to a leakage transformer used in, for example, a DC / AC inverter circuit used in a lighting circuit of a backlight discharge lamp in a display device of a TV monitor or a personal computer.

  A display device such as a personal computer includes a lighting circuit for a backlight discharge lamp. In this lighting circuit, a leakage transformer for driving the display device by increasing the voltage is generally used.

  This type of leakage transformer has a configuration described in Patent Document 1 and Patent Document 2, for example. In the configurations described in Patent Document 1 and Patent Document 2, one end side and the other end side of the primary winding are connected to two different terminals protruding from one terminal block. Further, one end side and the other end side of the secondary winding are connected to two different terminals protruding from the other terminal block.

Japanese Patent No. 2628524 (see claim 1, paragraph numbers 0010 and 0011, FIG. 1 and FIG. 5) Japanese Patent Laid-Open No. 2002-299134 (see paragraph numbers 0016 and 001, FIG. 5)

  In the configurations described in Patent Document 1 and Patent Document 2 as described above, both ends of the secondary winding are connected to two terminals protruding from the same terminal block. That is, the one end side and the other end side of the secondary winding are arranged in close proximity. Therefore, if dust or the like adheres to the two terminals where the one end side and the other end side of the secondary winding are connected, a short circuit occurs between the one end side and the other end side of the secondary winding on the high voltage side. There is a risk of occurring. When such a short circuit occurs, the leakage transformer may be damaged because the potential difference between the one end side and the other end side of the secondary winding is high.

  In order to prevent such a problem, it is possible to adopt a configuration in which the interval between two terminals to which one end side and the other end side of the secondary winding are connected is widened. However, if such a configuration in which the interval is widened is adopted, the leakage transformer becomes wide and the leakage transformer becomes large. In this case, the result is contrary to the demand for downsizing the leakage transformer.

  The present invention has been made on the basis of the above circumstances, and the object of the present invention is to prevent the secondary side winding from being short-circuited and to suppress the interval between terminals from becoming wide. The aim is to provide a possible leakage transformer.

In order to solve the above-described problems, the present invention provides a leakage transformer in which a secondary winding is arranged in a vertical direction with respect to a primary winding, and one end side and the other end side of the primary winding are respectively provided. together comprising a plurality of primary terminals to be tied, the other end of the first and terminal block, the secondary winding having a first binding terminals that Karageru one end of the secondary winding A second terminal block having a second binding terminal, a first winding frame around which the primary winding is wound, and a second winding around which the secondary winding is wound. A plurality of two-stage coil bobbins having a winding frame portion and integrating the first terminal block and the second terminal block, and disposed between the plurality of two-stage coil bobbins, The adjustment coil bobbin around which the adjustment part for adjusting the magnetic coupling is wound, the two-stage coil bobbin, and the adjustment coil bobbin are respectively held A columnar leg portion that, the and a side wall surrounding the outside of the column base are those comprising a core two-stage coil bobbin and the adjustment coil bobbin to the recess surrounded by the side wall is fitted, the.

  When comprised in this way, the one end side of a secondary side coil | winding is tied to the 2nd binding terminal which a 2nd terminal block comprises. In addition, one end side of the secondary winding is bound to the first binding terminal provided in the first terminal block. Therefore, the one end side and the other end side of the secondary winding are respectively provided in separate terminal blocks. Thereby, the one end side and the other end side of the secondary side terminal are arranged in the state of being close to the same terminal block, and short circuiting is prevented.

  By preventing such a short circuit, the leakage transformer is prevented from being damaged. In particular, a high potential difference is generated by excitation between one end side and the other end side of the secondary winding. Therefore, if the short circuit is prevented as described above, the leakage transformer can be satisfactorily prevented from being damaged. In addition, it is possible to suppress the interval between the terminals connecting the secondary winding from becoming wide.

  Moreover, when comprised as mentioned above, a primary side coil | winding and a secondary side coil | winding are wound around the 1st winding frame part and the 2nd winding frame part, respectively. In this case, since the two-stage coil bobbin is provided with the first winding frame part and the second winding frame part, one coil bobbin is provided as compared with the case where two coil bobbins are stacked in the height direction. Just do it. Therefore, the number of parts can be reduced, and the number of man-hours for assembling the coil bobbin can be reduced. Further, since the two-stage coil bobbin integrates the first terminal block and the second terminal block, one end side of the secondary side winding is the first binding terminal and the other end side is the second terminal block. It is possible to prevent problems such as loosening or disconnection of the winding of the secondary side winding after the winding terminal is wound. Therefore, it becomes easier to assemble compared to the case where the terminal block is a separate body. Further, since the coil bobbins are not stacked in the vertical direction, the leakage transformer can be reduced in height. An adjustment coil bobbin is provided, and an adjustment portion of the primary side winding is wound around the adjustment coil bobbin. Thereby, the adjustment portion can be reliably held by the adjustment coil bobbin. Moreover, the primary side winding is wound around the first winding frame portion of the two-stage coil bobbin. Therefore, when the primary side winding is attached, the bonding of the primary side winding becomes unnecessary, and the cost can be reduced.

In addition to the above-described inventions, the other invention further includes a distance between the root of the first binding terminal with respect to the first terminal block and the root of the primary terminal with respect to the first terminal block, In a state where the distance between the tip side of the first binding terminal and the tip side of the primary terminal is wider, the direction of the tip of the first binding terminal is in the direction of the tip of the primary terminal. In contrast, it is provided with an inclination.

When comprised in this way, the space | interval between a primary side terminal spreads as it goes to the front end side of a 1st binding terminal. For this reason, it is not necessary to make the space between the first binding terminal and the primary side terminal wider than necessary. Moreover, since the space | interval with a primary side terminal spreads as it goes to the front end side of a 1st binding terminal, even when making the said 1st binding terminal wind one end side of a secondary side coil | winding to the said 1st binding terminal The one end side is prevented from coming into contact with the primary side terminal.

Furthermore, in another invention, in a leakage transformer in which a secondary winding is arranged in a vertical direction with respect to a primary winding, a plurality of primary windings each having one end side and the other end side thereof are entangled. A first terminal block having a primary side terminal and having a first binding terminal for binding one end side of the secondary side winding and a second terminal side for binding the other end side of the secondary side winding A second terminal block having two binding terminals, and between the root of the first binding terminal with respect to the first terminal block and the root of the primary side terminal with respect to the first terminal block. In the state where the distance between the tip side of the first binding terminal and the tip side of the primary terminal is wider than the distance, the direction of the tip of the first binding terminal is the direction of the primary terminal. It is inclined with respect to the direction of the tip.

When comprised in this way, the one end side of a secondary side coil | winding is tied to the 2nd binding terminal which a 2nd terminal block comprises. In addition, one end side of the secondary winding is bound to the first binding terminal provided in the first terminal block. Therefore, the one end side and the other end side of the secondary winding are respectively provided in separate terminal blocks. Thereby, the one end side and the other end side of the secondary side terminal are arranged in the state of being close to the same terminal block, and short circuiting is prevented.
By preventing such a short circuit, the leakage transformer is prevented from being damaged. In particular, a high potential difference is generated by excitation between one end side and the other end side of the secondary winding. Therefore, if the short circuit is prevented as described above, the leakage transformer can be satisfactorily prevented from being damaged. In addition, it is possible to suppress the interval between the terminals connecting the secondary winding from becoming wide.
Moreover, the space | interval with a primary side terminal spreads as it goes to the front end side of a 1st binding terminal. For this reason, it is not necessary to make the space between the first binding terminal and the primary side terminal wider than necessary. Moreover, since the space | interval with a primary side terminal spreads as it goes to the front end side of a 1st binding terminal, even when making the said 1st binding terminal wind one end side of a secondary side coil | winding to the said 1st binding terminal The one end side is prevented from coming into contact with the primary side terminal.

  According to another invention, in addition to the above-described inventions, the direction of the tip of the first binding terminal is inclined within an angle range of about 30 to 60 degrees with respect to the direction of the tip of the primary side terminal. It is what.

  When configured in this manner, the distal end side of the first binding terminal is effectively expanded relative to the distal end side of the primary side terminal. Therefore, it is possible to satisfactorily wind the secondary winding around the first binding terminal.

  Further, according to another invention, in addition to each of the above-described inventions, the first binding terminal is electrically connected to a ground terminal to be connected to the ground, and the ground terminal is connected to the first terminal. It is arrange | positioned in the state adjacent to a binding terminal.

  In this configuration, when one end side of the secondary winding is entangled with the first binding terminal, one end side of the secondary winding is electrically connected to the ground. It becomes a state. Thereby, the one end side becomes a reference of potential. Further, as a result of the electrical connection between them, one end side of the secondary winding wound around the first binding terminal may come into contact with the ground terminal. For this reason, when one end side of the secondary winding is wound around the first binding terminal, it is not necessary to pay more attention than necessary.

  According to another invention, in addition to the above-described inventions, the two-stage coil bobbin further includes an upper collar part, a middle collar part, and a lower collar part, and the first collar part between the upper collar part and the middle collar part. Are provided, and a second reel portion is provided between the middle collar portion and the lower collar portion.

  In such a configuration, the middle flange portion of the two-stage coil bobbin serves as the lower collar portion of the first winding frame portion and the upper collar portion of the second winding frame portion. Compared with the case where they are stacked in the vertical direction, one hook portion is omitted. For this reason, the height can be lowered by one collar portion, and the leakage transformer can be reduced in height.

  Furthermore, in addition to each of the above-described inventions, the first binding terminal is provided on the rod-shaped body, and the primary side terminal and the tip side of the ground terminal are the first binding terminal. It protrudes toward the bottom surface side of the core.

  In such a configuration, since the height position of the distal end side of the secondary side terminal and the distal end side of the first binding terminal are different, the one end side of the secondary winding is connected to the first binding terminal. It becomes easy to wind around the terminal. Moreover, since the front end side of a primary side terminal and a ground terminal protrudes toward the bottom face side of a core, it becomes easy to connect the front end side of these primary side terminals and a ground terminal to a circuit board etc.

  In addition to the above-described inventions, in another invention, the core is further erected upward at a column base portion standing upward from the bottom surface and an outer peripheral edge portion of the bottom surface. And a lid core that is attached to the case core and that accommodates the two-stage coil bobbin and the adjustment coil bobbin at a portion between the case core and the case core.

  In such a configuration, the two-stage coil bobbin and the adjustment coil bobbin are housed in a portion between the case core and the lid core formed by the side wall. And a magnetic path can be formed between the case core which has a column base part and a side wall, and a cover core, and a secondary side coil | winding can be excited favorably.

  Further, according to another invention, in addition to each of the above-described inventions, the root of the first binding terminal in the first terminal block is more case core than the root of the primary terminal and the ground terminal in the first terminal block. It is located on the center side in the short direction.

  When comprised in this way, the base and front end side of a 1st binding terminal are located in the center side of a transversal direction rather than the base and front end side of a primary side terminal and a ground terminal. For this reason, the first binding terminal is in a state of being deeper than the primary side terminal and the ground terminal. Thus, when the tip side of the primary side terminal is immersed in the solder bath and the primary side terminal is soldered to the circuit board, the tip end side of the first binding terminal does not have to be immersed in the solder bath. As a result, it is possible to avoid a problem such that the one end side of the small secondary winding wound around the first binding terminal is disconnected by heat or the like.

  According to the present invention, it is possible to reduce the height of the leakage transformer. In addition, it is possible to reduce the manufacturing cost of the leakage transformer.

  Hereinafter, a leakage transformer according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing the configuration of the leakage transformer 10, and FIG. 2 is a perspective view showing the entire leakage transformer 10. 3 is a plan view of the leakage transformer 10, FIG. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is a rear view.

  As shown in FIG. 1, the leakage transformer 10 includes a case core 20, a two-stage coil bobbin 30, an adjustment coil bobbin 40, and a lid core 50 as main components. The case core 20 and the lid core 50 are made of a magnetic material having an insulating property. An example of the magnetic material is a nickel-based ferrite core. However, the material of the case core 20 and the lid core 50 is not limited to this, and other magnetic materials such as permalloy may be used. Further, the two-stage coil bobbin 30 and the adjustment coil bobbin 40 are made of an insulating and non-excited material such as resin, for example.

  As shown in FIG. 1, the case core 20 is an element constituting a part of the core, and is formed in a rectangular parallelepiped shape whose planar shape is a substantially rectangular shape. Further, the case core 20 has side walls 21 at both ends in the longitudinal direction (substantially left and right in FIG. 1), and a portion surrounded by the side walls 21 is a recessed portion where the two-stage coil bobbin 30 and the like are installed. 22 Therefore, although the recessed portion 22 is closed by the side walls 21 at both ends in the longitudinal direction of the case core 20, the edge portion of the case core 20 in the short direction (substantially up and down direction in FIG. 3) is opened. ing.

  The case core 20 is provided with four column base portions 23, 23, 24, 24. The column base parts 23, 23, 24, 24 protrude upward so as to be separated from the bottom surface 20a. These column base parts 23, 23, 24, 24 exist on two diagonal lines orthogonal to each other along the short direction and the long direction of the recessed part 22. Among these, the column base parts 23 and 23 along the diagonal line in the short direction are inserted into insertion holes 40 a and 40 a of the adjustment coil bobbin 40 described later. Moreover, the column base parts 24 and 24 along the diagonal of a longitudinal direction are inserted in center holes 30a and 30a of the two-stage coil bobbin 30 mentioned later. In addition, the diameter of each column base 23 is smaller than that of each column base 24. However, the diameter of each column base 23 may be formed to be larger than the diameter of each column base 24.

  In the following description, each column base 23 having a small diameter is referred to as a first column base 23. Each column base 24 having a diameter larger than that of the first column base 23 is defined as a second column base 24. Further, the upper side refers to the side on which the lid core 50 is attached as viewed from the bottom surface 20 a of the case core 20. Further, the lower side refers to the bottom surface 20 a side of the case core 20 when viewed from the attachment side of the lid core 50. Further, among the first column bases 23, those existing on the near side in FIG. 1 are referred to as first column bases 23a, and those existing on the back side in FIG. 1 are referred to as first column bases 23b. . In addition, among the second column bases 24, those existing on the left side in FIG. 1 are referred to as column bases 24a, and those existing on the right side in FIG. 1 are referred to as column bases 24b.

  Further, as shown in FIGS. 1 and 2, the two-stage coil bobbin 30 is provided integrally with a winding part 31 for winding the primary side winding 70 and the secondary side winding 71, and the winding part 31. The first terminal block 32a and the second terminal block 32b are provided.

  The winding part 31 has a substantially circular planar shape. Further, the winding part 31 is provided with an upper collar part 31a, a middle collar part 31b, and a lower collar part 31c sequentially from the top to the bottom. Here, a portion between the upper collar portion 31a and the middle collar portion 31b is a first winding frame portion 34a around which the primary winding 70 is wound. Moreover, the site | part enclosed by the middle collar part 31b and the lower collar part 31c becomes the 2nd winding frame part 34b, and the secondary side coil | winding 71 is wound here.

  In FIG. 1, the upper collar portion 31a, the middle collar portion 31b, and the lower collar portion 31c correspond to the winding portion 31 having a substantially circular planar shape so as to extend over the entire circumference of the circular shape. Is provided. Thereby, in FIG. 1, the shape of the winding part 31 is a pulley shape in which the external shape has two dents. However, the upper collar portion 31a and the middle collar portion 31b are not necessarily provided over the entire circumference. Since the primary side winding 70 is wound only on the side where the two two-stage coil bobbins 30 do not face each other in the winding part 31, the upper collar part 31a is located on the side where the two-stage coil bobbins 30 face each other. In addition, a configuration in which the first reel portion 34 does not exist without forming the intermediate collar portion 31b may be adopted.

  Further, the first terminal block 32 a and the second terminal block 32 b are located below the winding portion 31 in FIG. 1. The first terminal block 32a is a portion protruding to the near side in FIG. 1 and to the lower side in FIG. The first terminal block 32a is provided with a side surface 33a and a side surface 33b. Among these, the side surface 33 a is a side surface orthogonal to the short direction of the leakage transformer 10.

  The side surface 33b is provided so as to make a predetermined angle α (hereinafter referred to as an inclination angle α) with respect to a straight line along the side surface 33a. This inclination angle α is 45 degrees in the present embodiment. However, the inclination angle α is not limited to 45 degrees, and can be set to an appropriate inclination angle similarly to the inclination angle of the binding terminal 36 described later.

  As shown in FIGS. 1 to 6, the side surface 33 b is formed in a direction close to both ends in the longitudinal direction of the leakage transformer 10, not on the side adjacent to each other in the two-stage coil bobbins 30 arranged side by side. ing. That is, the side surface 33b is formed in the front corner portion of the leakage transformer 10 in FIG.

  Further, the terminal 35 protrudes from the side surface 33a. In the present embodiment, for example, four terminals 35 are provided. In the following description, when the terminals 35 are individually called, they are any of the terminals 35a to 35e. These five terminals 35a to 35e have a downward projecting portion 37a that descends downward, and a surface mounting portion 37b whose lower end side is substantially horizontal with respect to the installation site. And by soldering between each terminal 35a-35e and an installation site | part, the terminals 35a-35e and the circuit board of an installation site | part are electrically connected. The number of terminals 35 is not limited to five, and can be variously changed, for example, four.

  Moreover, in this Embodiment, the one end side and other end side of the primary side coil | winding 70 are connected (entangled) to the predetermined terminal 35 among the terminals 35b-35e. In the following description, the terminals 35b to 35e are referred to as primary side terminals 35b to 35e. Further, as will be described later, the terminal 35a is a ground terminal 35a. However, when calling both together, they are simply terminals 35a-35e.

  One end side or the other end side of the primary side winding 70 is wound around two of the primary side terminals 35b to 35e. Of these primary side terminals 35b to 35e, two of which the one end side and the other end side are entangled can be selected as appropriate.

  Moreover, as shown in FIGS. 1-6, the binding terminal 36 (equivalent to a 1st binding terminal) protrudes from the side surface 33b. The binding terminal 36 protrudes toward the normal direction of the side surface 33b. In the present embodiment, the side surface 33 b forms about 45 degrees with respect to the short direction of the leakage transformer 10. Therefore, the binding terminal 36 is arranged so as to make about 45 degrees with respect to the terminals 35a to 35e. That is, as shown in FIG. 3, the inclination angle α that the direction of the tip of the binding terminal 36 makes with the side surface 33a is about 45 degrees.

  Note that the inclination angle α is not limited to about 45 degrees, and is an angle that generates a predetermined gap with respect to the ground terminal 35a close to the binding terminal 36, and is one end side of the secondary winding 71. Any angle range may be used as long as it can be satisfactorily bound. Examples of the range of the inclination angle α include a range of 20 to 90 degrees.

  Moreover, if the inclination angle α is in the range of 30 to 60 degrees, the front end side of the binding terminal 36 is effectively expanded with respect to the front end side of the ground terminal 35a. Therefore, it is possible to satisfactorily wind the secondary winding 71 around the binding terminal 36. Furthermore, the binding terminal 36 is not limited to a configuration that protrudes in the normal direction of the side surface 33b, and may be configured to protrude obliquely with respect to the normal direction of the side surface 33b.

  In addition, when the inclination angle α is about 90 degrees, the binding terminal 36 cannot be said to protrude in an oblique direction with respect to the terminals 35a to 35e, but in the present embodiment, about 90 degrees. In this case, it is included in the oblique protrusion.

  As shown in FIGS. 4 and 5, the binding terminal 36 protrudes outward from substantially the same height position as the terminals 35 a to 35 e. However, the binding terminal 36 is smaller in size than the terminals 35a to 35e. That is, the binding terminal 36 has a shorter projecting length than the terminals 35a to 35e, a smaller width, and a smaller height. However, the binding terminal 36 has a sufficient size to wind the secondary side winding 71 a predetermined number of times.

  Further, the binding terminal 36 is electrically connected to the ground terminal 35a. In this case, the binding terminal 36 and the ground terminal 35a may be, for example, a metal integrally molded product, or may be connected to each other via a separate conducting wire or the like. The ground terminal 35a is connected to the ground side of a circuit board (not shown). For this reason, the binding terminal 36 is provided so as to serve as a potential reference.

  Further, the second terminal block 32b is a portion protruding in the back side in FIG. 1 and in the upper side of the drawing in FIG. In the present embodiment, there are two second terminal blocks 32b for each two-stage coil bobbin 30. Further, as shown in FIGS. 3, 5 and 6, similarly to the first terminal block 32 a, from the side surface on the outer diameter side of the second terminal block 32 b as viewed from the center of the two-stage coil bobbin 30. The terminal 38 protrudes. In the present embodiment, for example, four terminals 38 are provided. In the following description, when the terminals 38 are individually called, they are referred to as terminals 38a to 38d.

  Among these four terminals 38a to 38d, terminals 38b and 38c having a small protruding length are provided on the inner side, and terminals 38a and 38d having a large protruding length are provided on the outer side. Of these terminals 38b and 38c, the other end side of the secondary winding 71 is wound on one side. In the following description, the terminals 38b and 38c with which the other end of the secondary winding 71 is entangled are particularly referred to as entangled terminals 38b and 38c. Both the binding terminal 38b and the binding terminal 38c may be tangled at the other end of the secondary winding 71, and the binding terminals 38b and 38c correspond to the second binding terminal.

  The terminal 38a and the binding terminal 38b are electrically connected to each other, and the binding terminal 38c and the terminal 38d are electrically connected to each other. Therefore, the secondary winding 71 excited by the primary winding 70 outputs a predetermined potential from the binding terminal 38b to the terminal 38a and from the binding terminal 38c to the terminal 38d. Further, since the terminal 38a and the terminal 38d are respectively connected on the circuit board, the alternating current generated by the excitation flows to a predetermined circuit existing on the circuit board.

  Similarly to the terminals 35a to 35e described above, the terminals 38a and 38d have a downward projecting portion 39a that descends downward and a surface mounting portion 39b whose lower end side is substantially horizontal to the installation portion. ing.

  As shown in FIG. 6, a lead-out portion 33c is provided on the back side of the first terminal block 32a and the second terminal block 32b. When the lead-out portion 33c leads the secondary-side winding 71 from the winding portion toward the external binding terminal 36 and the binding terminals 38b and 38c, the secondary-side winding 71 It is a hollow part in which a conducting wire (not shown) is located. The lead-out portion 33c is provided with a protrusion 33d. The protrusion 33d is a part capable of receiving the conducting wire on the outer surface side thereof.

  Here, when the lead wire of the secondary winding 71 is led out toward the binding terminal 36 and the binding terminals 38b and 38c, the lead wire is brought into contact with the protrusion 33d. Thereafter, the conductor is wound around the terminal 36 in a direction in which the contact of the conductor with the protrusion 33d is maintained. By winding the conductive wire around the binding terminal 36 and the binding terminals 38b and 38c in this way, it is possible to prevent the conductive wire from sagging.

  As shown in FIGS. 1 and 6, the case core 20 is provided with a notch 25 corresponding to the fitting of the second terminal block 32b. In the present embodiment, two notches 25 are provided along one side in FIG. 6 (the side on the upper side of the paper in FIG. 6). In addition, the case core 20 is also provided with a notch 26 for deriving a conductive wire wound around the binding terminal 36 on the first terminal block 32a side.

  In addition, an adjustment coil bobbin 40 is disposed in a portion between the two-stage coil bobbins 30 facing each other. As shown in FIGS. 7 to 12, the adjustment coil bobbin 40 is a portion around which the adjustment portion 70 a of the primary winding 70 is wound. Further, the adjustment coil bobbin 40 is disposed so that the short side direction of the leakage transformer 10 is the long side. Moreover, the adjustment coil bobbin 40 is provided so as to be symmetric with respect to a line along the short direction passing through the center thereof.

  As shown in FIGS. 1 and 7, the adjustment coil bobbin 40 is provided with a pair of cylindrical portions 41 along the longitudinal direction thereof. The cylindrical portion 41 is provided with an insertion hole 40a so as to penetrate the adjustment coil bobbin 40 in the vertical direction. The first column base portions 23a and 23b described above are inserted into the insertion hole 40a. Further, a substantially flat upper surface portion 42 is provided above the adjustment coil bobbin 40. The upper surface portion 42 is a long body and is provided along the length of the adjustment coil bobbin 40. Of the upper surface portion 42, a portion closer to the end portion than the insertion hole 40 a is an upper collar portion 42 a that protrudes toward the end portion side in the longitudinal direction from the cylindrical portion 41.

  An intermediate surface portion 43 is provided below the upper surface portion 42 so as to face the upper surface portion 42. The middle surface portion 43 is provided so as to have substantially the same flat plate shape as the above-described upper surface portion 42. In addition, a portion of the inner surface portion 43 that is closer to the end portion than the insertion hole 40 a is a lower collar portion 43 a that protrudes toward the end portion side in the longitudinal direction rather than the tubular portion 41. A portion surrounded by the lower flange portion 43a, the upper flange portion 42a, and the outer peripheral surface of the cylindrical portion 41 is an adjustment reel portion 44 around which the adjustment portion 70a is wound.

  Moreover, the front crack part 46 is provided in the front side part in FIG. 1 among the lower collar parts 43a. The leading crack 46 functions as a guide for drawing the primary winding 70 to any of the primary terminals 35b to 35e. Here, as shown in FIG. 1, the cracked portion 46 has a plurality of slit-shaped portions, and the primary winding 70 is inserted into the slit-shaped portions. As a result, the primary winding 70 is guided downward and entangled with any of the primary terminals 35b to 35e. In addition, this crack part 46 may be abbreviate | omitted.

  Further, the upper surface portion 42, the middle surface portion 43, and the bottom surface portion 45 are provided at a portion between the two-stage coil bobbins 30 that are arranged to face each other. Therefore, curved concave portions 47 are provided on both side edges of the upper surface portion 42, the middle surface portion 43, and the bottom surface portion 45 along the short direction thereof. Each of the curved concave portions 47 is formed in a shape that follows the outer peripheral edge portions of the upper flange portion 31a, the middle flange portion 31b, and the lower flange portion 31c of the two-stage coil bobbin 30.

  In the present embodiment, a positioning protrusion 48 as shown in FIG. 1 to FIG. 3 is provided on the end portion in the longitudinal direction of the upper collar portion 42a. The positioning protrusion 48 is provided so that the planar shape thereof is a substantially almond-shaped protrusion. In the present embodiment, the two positioning protrusions 48 are arranged along the longitudinal direction of the adjustment coil bobbin 40.

  In addition, the shape of the positioning protrusion 48 is not restricted to the shape shown in FIGS. For example, a positioning protrusion having a substantially trapezoidal appearance may be used. In addition, the positioning protrusions can be formed in various shapes such as a cylindrical shape.

  In addition, a lid core 50 serving as a core component is located on the upper portion of the case core 20. For example, as shown in FIG. 12, the lid core 50 has a recess 51 corresponding to the above-described recess 22. The recessed portion 51 is provided with a protruding portion 52 having a small protruding length so as to face the above-described column base portions 23 and 24. The protruding portion 52 faces the column base portions 23 and 24 with a slight gap g (see FIG. 12) in a state where the lid core 50 is attached to the case core 20.

  In the present embodiment, the protrusion 52 is not inserted into the center hole 30 a of the two-stage coil bobbin 30. However, the protruding portion 52 may also be configured so as to be inserted into the center hole 30 a of the two-stage coil bobbin 30 together with the column base portions 23 and 24. In this case, the height position of the upper end surface of the two-stage coil bobbin 30 may be made higher than the upper ends of the column base portions 23 and 24. In this way, since the protrusion 52 is inserted into the center hole 30a, it is possible to prevent the lid core 50 from shifting without providing a positioning projection 48 and a notch 53 which will be described later.

  Moreover, it is good also as a flat structure, without providing the protrusion part 52 etc. in the recessed part 51 of the cover core 50. FIG. In this case, the column base parts 23 and 24 may be slightly shorter than the side wall 21, and a gap may be formed between the column base parts 23 and 24 and the lid core 50.

  As shown in FIGS. 1 to 3, the lid core 50 has a substantially rectangular planar shape, and is cut out in an arc shape from the long side of the substantially rectangular shape upward. 53. The above-described positioning projection 48 is fitted into the notch 53. In the present embodiment, two notches 53 are provided, one for each of the two long sides. The shape of the lid core 50 can be variously changed. For example, the outer appearance of the lid core 50 may have a substantially similar shape that is slightly large enough to close the recessed portion 22 so that the recessed portion 22 can be closed well.

  A method for manufacturing the leakage transformer 10 having the above configuration will be described below. The manufacturing method will be described with reference to FIGS. In the description of the manufacturing method, the configuration of the jig 60 used for manufacturing will also be described.

  First, the primary side winding 70 is wound around the adjustment winding frame portion 44 to form the adjustment portion 70a. In this case, the number of turns of the primary side winding 70 may be, for example, a minimum of about 2-3 turns. When the adjustment portion 70a is formed, the other portions of the primary side winding 70 that are not wound are kept stretched by the winding nozzle of the winding machine.

  Next, the adjustment coil bobbin 40 is attached to the jig 60 (see FIG. 7). The jig 60 is formed such that its planar shape does not interfere with the positioning protrusions 48 and the like. The jig 60 is provided with first protrusions 61a and 61b (see FIG. 7 and others). The first protrusions 61a and 61b have the same diameter as the first column bases 23a and 23b described above. For this reason, even if the first protrusions 61a and 61b are inserted into the insertion hole 40a, the adjustment coil bobbin 40 does not rattle. Here, the adjustment coil bobbin 40 is attached in a state of being positioned below the jig 60 (see FIG. 7 and others).

  Note that the step of attaching the adjustment coil bobbin 40 to the jig 60 may be executed earlier than the step of winding the primary side winding 70 around the adjustment coil bobbin 40.

  Further, the secondary winding 71 is wound around the second winding frame portion 34b. In this case, the other end side of the secondary winding 71 is tied to one of the two binding terminals 38b and 38c. Next, the secondary winding 71 is wound around the second winding frame part 34b. Finally, one end side of the secondary winding 71 is bound to the binding terminal 36. In this way, the winding of the secondary winding 71 is completed. First, one end side of the secondary winding 71 is bound to the binding terminal 36, and finally the other end side of the secondary winding 71 is set to one of the two binding terminals 38b and 38c. You may make it entangle with.

  Then, after the winding of the secondary winding 71 and after the adjustment coil bobbin 40 is attached to the jig 60, the two-stage coil bobbin 30 is attached to the jig 60 (see FIG. 8). Here, as shown in FIG. 7 and the like, the jig 60 is provided with second protrusions 62a and 62b. The second projecting portions 62a and 62b have the same diameter as the above-described second column base portions 24a and 24b. For this reason, even if the two-stage coil bobbin 30 is inserted into the center hole 30a of the two-stage coil bobbin 30, the two-stage coil bobbin 30 does not rattle.

  After the two-stage coil bobbin 30 is attached to the jig 60, the primary winding 70 is wound around the first winding frame portion 34a (see FIG. 9). In this case, the primary winding 70 after the adjustment portion 70a is formed is wound. The primary winding 70 is stretched by the winding nozzle of the winding machine. In this state, the winding machine is operated so as to wind the first reel portion 34a. Then, the stretched portion of the primary winding 70 is sequentially wound around the first winding frame portion 34a.

  After the primary winding 70 is wound by a predetermined number of turns, the adjustment coil bobbin 40 and the two-stage coil bobbin 30 are fitted into the recessed portion 22 (see FIGS. 10 and 11). In this case, the front end sides of the first column base portions 23a and 23b and the second column base portions 24a and 24b are gradually inserted from the lower side of the center hole 30a and the insertion hole 40a, respectively. Then, as the insertion proceeds, the jig 60 is removed by being pushed toward the distal end sides of the first column base portions 23a and 23b and the second column base portions 24a and 24b.

  Next, the lid core 50 is attached and fixed to the case core 20 so as to close the recessed portion 22 (see FIG. 12). In this case, the lid core 50 is attached in a state where the positioning protrusion 48 is fitted into the notch 53. Further, when the lid core 50 is attached, as shown in FIG. 12, the projecting portion 52 faces the column base portions 23 and 24 with a gap g.

  Further, in FIG. 1 and FIG. 2, side wall cores (not shown) may be attached to the near side and the far side to close the near side and the far side of the recessed portion 22. If it does in this way, the open part of the recessed part 22 will be block | closed with a side wall core, and it will reduce that magnetic flux leaks outside.

  By executing the steps as described above, the leakage transformer 10 is in a completed state as shown in FIGS. In addition, after completion of the leakage transformer 10, the tip side of the terminals 35a to 35e, 38a, 38d is immersed in a solder bath, and solder is applied to the tip side. And alignment between this front end side and the predetermined site | part of a circuit board not shown is performed, and both are joined. In this case, the circuit board side may be joined in a state where solder is applied.

  In the leakage transformer 10 having such a configuration, one end side of the secondary winding 71 is bound to the binding terminal 36. Further, the other end side of the secondary winding 71 is bound to one of the binding terminals 38b and 38c. Therefore, one end side and the other end side of the secondary winding 71 are wired toward the terminal blocks 32a and 32b arranged in different directions. As a result, the distance between the one end side and the other end side of the secondary side terminal 71 is increased, and even when dust or the like adheres, it is possible to prevent short-circuiting.

  Further, the leakage transformer 10 is prevented from being damaged by preventing such a short circuit. In particular, a high potential difference is generated by excitation between one end side and the other end side of the secondary winding 71. Therefore, if the short circuit is prevented as described above, breakage of the leakage transformer 10 can be satisfactorily prevented.

  Further, the binding terminal 36 is provided to be inclined with respect to the terminals 35a to 35e. For this reason, the space | interval between adjacent ground terminals 35a spreads toward the front end side of the binding terminal 36. For this reason, it is not necessary to make the space between the binding terminal 36 and the ground terminal 35a wider than necessary. In particular, in the above-described embodiment, the inclination angle α is provided to make about 45 degrees with respect to the side surface 33a. Therefore, the front end side of the binding terminal 36 is effectively expanded with respect to the front end side of the ground terminal 35 a, and the secondary winding 71 can be wound around the binding terminal 36 satisfactorily.

  Further, the binding terminal 36 protrudes in an inclined state with respect to the terminals 35a to 35e, and the leading end side of the binding terminal 36 does not protrude outward from the leading end side of the terminals 35a to 35e. For this reason, when the tip side of the terminals 35a to 35e is immersed in the solder bath and the terminals 35a to 35e are soldered to the circuit board, it is not necessary to immerse the tangled terminals 36 in the solder bath. As a result, it is possible to avoid a problem such that one end side of the small-diameter secondary winding 71 wound around the binding terminal 36 is disconnected by heat or the like.

  The binding terminal 36 is connected to the ground terminal 35 a, and the ground terminal 35 a is disposed adjacent to the binding terminal 36. Therefore, when one end side of the secondary winding 71 is tied to the binding terminal 36, one end side of the secondary winding 71 is connected to the ground. Thereby, the one end side becomes a reference of potential. Further, the secondary winding 71 entangled with the binding terminal 36 may come into contact with the ground terminal 35a, and when one end side of the secondary winding 71 is wound around the binding terminal 36, You don't have to be more careful than necessary.

  Further, the two-stage coil bobbin 30 is provided with a first winding frame portion 34a and a second winding frame portion 34b. For this reason, as compared with the conventional case where two coil bobbins are stacked in the height direction (see FIG. 10), only one coil bobbin needs to be provided, and the number of parts can be reduced. As a result, the number of man-hours for assembling the coil bobbin can be reduced.

  In particular, the two-stage coil bobbin 30 has an upper collar part 31a, a middle collar part 31b, and a lower collar part 31c, and the first winding frame part 34a is located between the upper collar part 31a and the middle collar part 31b. A second reel portion 34b is provided between the portion 31b and the lower collar portion 31c. For this reason, the middle collar part 31b serves as the role of the lower collar of the first winding frame part 34a and the function of the upper collar of the second winding frame part 34b. Therefore, compared with a case where two coil bobbins are stacked in the height direction, only one hook portion is omitted, and the height can be lowered by that amount, which contributes to a reduction in the height of the leakage transformer 10.

  The first terminal block 32 a and the second terminal block 32 b are provided integrally with the two-stage coil bobbin 30. For this reason, the positions of the first terminal block 32 a and the second terminal block 32 b do not shift with respect to the two-stage coil bobbin 30. Thereby, after winding one end side of the secondary winding 71 to the binding terminal 36 and binding the other end side to the terminals 38b and 38c, the winding of the secondary winding 71 is loosened, Problems such as disconnection of the side winding 71 can be prevented.

  Further, since the adjustment coil bobbin 40 is provided, the adjustment portion 70 a is wound around the adjustment winding frame portion 44 of the adjustment coil bobbin 40. Thereby, the adjustment portion 70 a can be reliably held by the adjustment reel portion 44.

  In particular, the adjustment coil bobbin 40 has an adjustment winding frame portion 44 that is divided by an upper flange portion 42a and a lower flange portion 43a. Therefore, the adjustment winding frame portion 44 is wound around the adjustment portion 70a. In doing so, it plays the role of a guide. Thereby, winding of the adjustment part 70a is ensured. Further, the primary coil 70 can be easily wound around the adjustment coil bobbin 40 using a winding machine. Therefore, compared with the case where the primary coil 70 is wound around the first column base 23 or the like directly existing in the case core 20 without providing the adjustment coil bobbin 40, the primary coil is not required. The side winding 70 can be wound, so that the working efficiency can be improved.

  Moreover, it winds in the state in which the primary side coil | winding 70 is spanned around the two 1st winding frame parts 34a. Therefore, when the primary side winding 70 is wound, the bonding of the primary side winding 70 becomes unnecessary, and the cost can be reduced.

  Further, two two-stage coil bobbins 30 are provided, and an adjustment coil bobbin 40 is disposed at a portion between the two two-stage coil bobbins 30 facing each other. For this reason, the primary side winding 70 is wound before the winding to the two-stage coil bobbin 30 to form the adjustment portion 70a, and then the two-stage coil bobbin 30 is arranged adjacent to the adjustment coil bobbin 40 on both sides. For example, the entire primary winding 70 can be satisfactorily held by the adjustment coil bobbin 40 and the two-stage coil bobbin 30. Further, the holding eliminates the need for bonding the primary winding 70.

  Further, the binding terminal 36 is provided in a rod-like body, and the distal ends of the terminals 35 a to 35 e protrude toward the bottom surface side of the case core 20 from the binding terminal 36. Therefore, the height position of the distal end side of the secondary terminal 71 and the distal end side of the binding terminal 36 are different. Thereby, one end side of the secondary winding 71 is easily wound around the first binding terminal. Moreover, since the front end side of the terminals 35a-35e protrudes toward the bottom face side of the case core 20, it becomes easy to connect the front end side of the terminals 35a-35e to a circuit board or the like.

  The core includes a case core 20 and a lid core 50, and the case core 20 is provided with a first column base 23, a second column base 24, and a side wall 21. For this reason, the two-stage coil bobbin 30 and the adjustment coil bobbin 40 are accommodated in the recessed portion 22 formed by the side wall 21. A magnetic path can be formed between the first column base 23, the second column base 24, the case core 20 having the side wall 21, and the lid core 50, and the secondary winding 71. Can be excited well.

  Furthermore, the base of the binding terminal 36 is located closer to the center side in the short direction of the case core 20 than the bases of the terminals 35a to 35e. For this reason, the starting point of the binding terminal 36 is deeper than the roots of the terminals 35a to 35e. Further, in the present embodiment, the root of the binding terminal 36 exists on the side surface 33 b that forms about 45 degrees with respect to the short direction of the leakage transformer 10. For this reason, compared with the case where the side surface 33b faces the same direction as the side surface 33a, the area of the side surface 33b can be increased, and when the secondary side winding 71 is wound, the secondary side The side winding 71 can be received well.

  Further, the front end side of the binding terminal 36 is located on the center side in the longitudinal direction of the case core 20 from the end portion in the longitudinal direction of the case core 20. For this reason, the binding terminal 36 does not protrude outward from the longitudinal end portion of the case core 20. Thereby, the binding terminal 36 does not protrude too much to the outside. Therefore, for example, even if the leakage transformer 10 is installed inside a notebook personal computer or the like, the binding terminal 36 does not get in the way. Further, the leakage transformer 10 can be made compact.

  Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to this. This will be described below.

  In the above-described embodiment, the first terminal block 32a is provided with the side surface 33b, and the binding terminal 36 protrudes from the side surface 33b. However, the tangled terminal 36 may not be configured to protrude from the side surface 33b. For example, instead of providing the side surface 33b inclined with respect to the short side direction of the leakage transformer 10, a side surface parallel to the short side direction may be provided, and the binding terminal 36 may protrude from the side surface. good.

  Moreover, in the above-mentioned embodiment, the binding terminal 36 is comprised from the linear rod-shaped body thinner than the terminals 35a-35e. However, the shape of the binding terminal 36 is not limited to this. For example, the shape of the binding terminal 36 may be formed in a hook shape so that one end side of the secondary winding 71 can be easily bound. In the above-described embodiment, the first terminal block 32 a and the second terminal block 32 b are provided integrally with the two-stage coil bobbin 30. However, these may be provided separately. In this case, for example, a configuration in which only the first terminal block 32a or only the second terminal block 32b is provided separately can be employed. In this case, after assembling a separate terminal block, the secondary winding 71 is entangled.

  In the above-described embodiment, the binding terminal 36 and the ground terminal 35a are connected. However, the two may be separated and independent without being connected. Further, in the case of separate independence, the binding terminal 36 may be grounded.

  In the above-described embodiment, the primary coil 70 and the secondary coil 71 are wound around the secondary coil bobbin 30 using the secondary coil bobbin 30. However, a configuration using a coil bobbin other than the two-stage coil bobbin 30 may be adopted. For example, a coil bobbin around which the primary winding 70 is wound and a coil bobbin around which the secondary winding 71 is wound may be provided separately and arranged so as to overlap each other. Even in this case, it is possible to prevent a short circuit from occurring between the one end side and the other end side of the secondary winding 71 on the high voltage side, and it is possible to achieve a good effect. Thereby, breakage of the leakage transformer 10 can be prevented.

  In the above-described embodiment, the number of the two-stage coil bobbins 30 is two. However, the number of the two-stage coil bobbins 30 is not limited to two, and can be variously changed, for example, four. In addition, when the number of the two-stage coil bobbins 30 is provided, for example, it is necessary to provide four second column base parts 24, but even in that case, since the two winding frame parts 34a and 34b are provided, Low profile can be achieved. Further, the bonding of the primary winding 70 is not necessary.

  Furthermore, in the above-described embodiment, the terminals 35a to 35e and the terminals 38a and 38d have surface mounting portions 37b and 39b which are surface mounted. However, the terminals 35a to 35e and the terminals 38a and 38d are not limited to the configuration having the surface mounting portions 37b and 39b. For example, a configuration that protrudes downward so as to be inserted into the circuit board may be adopted. good.

  The leakage transformer 10 described above is not limited to being used as a backlight discharge lamp in a display device of a notebook personal computer, and can be used in various electronic devices. Examples thereof include a mobile phone device display device, a car navigation display device, a fluorescent lamp, and a PDP.

  Furthermore, in the above-described embodiment, the core includes the case core 20 and the lid core 50 that are open on the front side and the back side in FIG. However, the core is not limited to this. For example, you may comprise so that the side wall 21 may be provided over the perimeter of the side edge of the case core 20. FIG.

  Moreover, in the above-mentioned embodiment, the upper collar part 31a, the middle collar part 31b, and the lower collar part 31c are continuously arranged on the side where at least two winding parts 31 do not face each other in the arc of the winding part 31. Is provided. However, the upper collar part 31a, the middle collar part 31b, and the lower collar part 31c do not need to be provided in this way. For example, it is good also as an intermittent shape which notched a part of upper collar part 31a, middle collar part 31b, and lower collar part 31c at predetermined intervals.

  The leakage transformer of the present invention can be used, for example, as a backlight discharge lamp for a display device of a notebook personal computer.

It is a disassembled perspective view which shows the structure of the leakage transformer which concerns on one embodiment of this invention. It is a perspective view which shows the whole leakage transformer of FIG. It is a top view which shows the structure of the leakage transformer of FIG. It is a front view which shows the structure of the leakage transformer of FIG. It is a side view which shows the structure of the leakage transformer of FIG. It is a rear view which shows the structure of the leakage transformer of FIG. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is an end view explaining the state which made the jig hold | maintain the adjustment coil bobbin. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is an end view which shows the state which made the jig hold | maintain the two-stage coil bobbin. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is an end elevation which shows the state by which the primary side coil | winding was wound by the 1st winding frame part of the two-stage coil bobbin. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is an end elevation which shows the state just before inserting in a case core in the state hold | maintained at the jig with the two-stage coil bobbin and the adjustment coil bobbin. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is an end elevation which shows the state in which the two-stage coil bobbin and the adjustment coil bobbin were attached to the case core. It is a figure explaining the manufacturing method of the leakage transformer of FIG. 1, and is sectional drawing which shows the state which the lid core was attached and the leakage transformer was completed.

Explanation of symbols

10 ... Leakage transformer 20 ... Case core (part of core)
21 ... Side wall part 22 ... Recessed part 23, 23a, 23b ... 1st column base part (column base part)
24, 24a, 24b ... 2nd column base (column base)
30 ... Two-stage coil bobbin 31 ... Winding part 31a ... Upper collar part 31b ... Middle collar part 31c ... Lower collar part 32a ... First terminal block 32b ... Second terminal block 34a ... First winding frame part 34b ... First 2 winding frame part 35a ... ground terminals 35b-35e ... primary side terminal 36 ... binding terminal (first binding terminal)
38a, 38d ... terminal 38b, 38c ... binding terminal 40 ... adjustment coil bobbin 42 ... upper surface part 42a ... upper collar part 43 ... middle surface part 43a ... lower collar part 44 ... reel part 46 ... tip crack part 48 ... positioning projection 50 ... lid core (part of core)
60 ... Jig 61a, 61b ... 1st protrusion part 61c, 61d ... 2nd protrusion part 70 ... Primary side winding 70a ... Adjustment part 71 ... Secondary side winding

Claims (9)

In the leakage transformer in which the secondary side winding is arranged in the vertical direction with respect to the primary side winding,
A first primary terminal including a plurality of primary terminals that are respectively connected to one end side and the other end side of the primary winding, and a first binding terminal that is connected to one end side of the secondary winding. Terminal block,
A second terminal block comprising a second binding terminal for binding the other end of the secondary winding;
A first winding frame portion around which the primary side winding is wound; and a second winding frame portion around which the secondary winding is wound. A plurality of two-stage coil bobbins integrating the terminal block of
An adjustment coil bobbin disposed between the plurality of two-stage coil bobbins and wound around an adjustment portion for adjusting magnetic coupling in the primary winding;
Each of the two-stage coil bobbin and the adjustment coil bobbin has a column base that holds the two-stage coil bobbin and the adjustment coil bobbin, and a side wall that surrounds the outside of the column base part. The core to be fitted,
A leakage transformer comprising: More than the space between the root of the first binding terminal with respect to the first terminal block and the root of the primary terminal with respect to the first terminal block, the tip side of the first binding terminal and the In a state where the distance between the front end side of the primary side terminal is wider, the direction of the front end of the first binding terminal is inclined with respect to the direction of the front end of the primary side terminal. The leakage transformer according to claim 1, wherein: In the leakage transformer in which the secondary side winding is arranged in the vertical direction with respect to the primary side winding,
A first primary terminal including a plurality of primary terminals that are respectively connected to one end side and the other end side of the primary winding, and a first binding terminal that is connected to one end side of the secondary winding. Terminal block,
A second terminal block comprising a second binding terminal for binding the other end of the secondary winding;
And having
More than the distance between the root of the first binding terminal with respect to the first terminal block and the root of the primary terminal with respect to the first terminal block, the tip side of the first binding terminal and the above In a state where the distance between the front end side of the primary side terminal is wider, the direction of the front end of the first binding terminal is inclined with respect to the direction of the front end of the primary side terminal. Yes,
This is a leakage transformer.   The direction of the front end of the first binding terminal is inclined within an angle range of approximately 30 to 60 degrees with respect to the direction of the front end of the primary side terminal. The leakage transformer according to claim 1.   The first binding terminal is electrically connected to a ground terminal to be connected to the ground, and the ground terminal is disposed adjacent to the first binding terminal. The leakage transformer according to any one of claims 1 to 4, wherein:   The two-stage coil bobbin has an upper collar part, a middle collar part, and a lower collar part, and the first winding frame part is provided between the upper collar part and the middle collar part, and the middle collar part and the above-mentioned The leakage transformer according to any one of claims 2 to 5, wherein the second winding frame portion is provided between the lower collar portions.   The first binding terminal is provided on a rod-like body, and the leading end side of the primary side terminal and the ground terminal protrudes toward the bottom surface side of the core from the first binding terminal. The leakage transformer according to any one of claims 2 to 6, wherein the leakage transformer is provided. The core is
A case core comprising the column base portion erected upward from the bottom surface, and the side wall erected upward at the outer peripheral edge of the bottom surface;
A lid core that is attached to the case core and that houses the two-stage coil bobbin and the adjustment coil bobbin in a portion between the case core,
The leakage transformer according to any one of claims 2 to 7, further comprising:   The root of the first binding terminal in the first terminal block is located closer to the center side in the short direction of the case core than the root of the primary terminal and the first terminal block of the ground terminal. The leakage transformer according to any one of claims 5 to 8, wherein the leakage transformer is provided.

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